GEOLOGICAL AGE OF PRINCE EDWARD ISLAND. WATSON. 149 



of the Pelycosaurs, such as occur in the Texas region, probably 

 a Demetrordon or Nausaurus, "characteristic of, and not sur- 

 viving the permian age." 



Simultaneously, and independently ; Dr. Von Huehne pub- 

 lished a paper (N. Jahrb. f. M. G. u. P. Beilage, band- xx., 

 p. 343) in which he arrived at the same conclusion as to the 

 nature of the fossil and the age of the beds in which it was 

 found. In his "Revision of The Pelycosauria," published by 

 the Carnegie Institution of Washington (1907), Mr. Case 

 restates his conviction that the animal was a dinosaur 

 characteristic of the Trias, but one of the Pelycosauria, "a 

 highly specialized, primitive side branch of the Bhyncocephalia, 

 which seemingly became extinct at the end of the Permian 



Thus, as the existence of Triassic deposits in the northern 

 and central parts of Prince Edward Island depends, even 

 according to the enthusiastic champion of the theory, Francis 

 Bain, entirely upon the supposition that Bathygnathus borealis, 

 Leidy, was a dinosaur, and, as the animal has been adjudged a 

 pelycosaur of Permian time by indisputable authorities, the 

 conclusion is inevitable that, in the present state of our know- 

 ledge, Triassic deposits cannot be said to occur in this region, 

 and that the whole rock system of the island is referable to 

 the Permo-Carboniferous age. 



